diff --git a/bfcodegen/id-generate.go b/bfcodegen/id-generate.go
index 59cab5e..700dfbb 100644
--- a/bfcodegen/id-generate.go
+++ b/bfcodegen/id-generate.go
@@ -209,6 +209,13 @@ func fmtIDOutput(cs string, ids []IDDef, pkgname string) string {
 
 		str += "" + "\n"
 
+		str += "func (i " + iddef.Name + ") Valid() bool {" + "\n"
+		str += "	_, err := primitive.ObjectIDFromHex(string(i))" + "\n"
+		str += "	return err == nil" + "\n"
+		str += "}" + "\n"
+
+		str += "" + "\n"
+
 		if anyDef != nil {
 			str += "func (i " + iddef.Name + ") AsAny() " + anyDef.Name + " {" + "\n"
 			str += "	return " + anyDef.Name + "(i)" + "\n"
diff --git a/goextVersion.go b/goextVersion.go
index 2171ae7..600573b 100644
--- a/goextVersion.go
+++ b/goextVersion.go
@@ -1,5 +1,5 @@
 package goext
 
-const GoextVersion = "0.0.263"
+const GoextVersion = "0.0.264"
 
-const GoextVersionTimestamp = "2023-09-18T10:43:29+0200"
+const GoextVersionTimestamp = "2023-09-18T11:46:17+0200"